@article{oai:repo.qst.go.jp:00058539,
 author = {Fujiwara, Taisei and Toyoda, Shin and Ai, Uchida and Ishibashi, Jun-ichiro and Shun’ichi, Nakai and Takamasa, Asako and 賞雅 朝子},
 journal = {Subseafloor Biosphere Linked to Hydrothermal Systems},
 month = {Jan},
 note = {ESR (electron spin resonance) ages were determined for barite crystals extracted from
hydrothermal sulfide deposits taken at Daiyon-Yonaguni Knoll field, Hatoma Knoll field,
Iheya North Knoll field, Hakurei Site of Izena Hole field, Yoron Hole field of the Okinawa
Trough. The ages range from 4.1 to 16,000 years, being consistent with detection of 228Ra
in younger samples and radioactive equilibrium/disequilibrium between radium and daughter
nuclei. The variation of the ages within each sample is mostly within the statistical error
range. The relative order of the ages is consistent with the result of 226Ra-210Pb method, but
the determining absolute ages is still an issue. The order of ages of the 5 hydrothermal fields
would be arranged, from young to old as follows; Yoron Hole field, Daiyon-Yonaguni
Knoll field, Hatoma Knoll field, being nearly equal to Iheya North Knoll field.},
 pages = {369--386},
 title = {ESR Dating of Barite in Sea-Floor Hydrothermal Sulfide Deposits in the Okinawa Trough},
 year = {2015}
}